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Family: LentitheciaceaeGenus: Keissleriella
Anamorph: not known.
Teleomorph: ascostromata perithecia, 80-230 µm diam., ± globose, immersed, the neck papillate, hardly extending beyond the substratum surface. Peridium thin, 5-15 µm thick, composed of several layers of angular to elongate brown cells 5-12 µm diam., more strongly pigmented around the ostiole which is sometimes surrounded by very short narrow blunt-tipped setae. Interascal tissue composed of branched and anastomosing cellular pseudoparaphyses ca 2 µm diam. Asci 59-75 x 7.5-8.5 µm, narrowly clavate with a tapering stalk, the apex obtuse to rounded, fairly thick-walled and fissitunicate with a distinct ocular chamber when immature, not staining in iodine, 8-spored. Ascospores arranged biseriately, (10.5-) 11-12.5 (-13) x 3.5-4 µm, fusiform to fusiform-ellipsoidal, strongly constricted at the media to slightly supramedian septum, the upper cell swollen near the septum, hyaline, fairly thick-walled, smooth, surrounded by a gelatinous sheath ca 1 µm thick laterally and to 3.5 µm thick at the apices.
Description partly adapted from Bose (1961).